Swaging-forceps.



PATBNTED JULY 2, 1907.

P. A. MERGER. SWAGING FORCEPS.

APPLICATION FILED 13110.4, 190s.

Tu: NORRIS Fsfzns ca, WASHINGYON. p. c,

PLINY A. MERGER, OF MONTPELIER, OHIO swAeING-FoRoEPs.

Specification of Letters Patent.

Patented July 2, 1907.

Application filed December 4,1906. Serial No. 346,237.

To all whom it may concern:

Be it known that I, PLINY A. MERCER, a citizen of the United States,residing at Montpelier, in the county of Williams and State of Ohio,have invented certain new and useful Improvements in Swaging-Forceps, ofwhich the following is a specification, reference being had therein tothe accompanying drawing.

My invention relates to improvements in swaging forceps for the use ofdentists, and consists in the novel construction, combination andarrangement of parts hereinafter described and claimed.

The object of the invention is to provide a simple and practical tool ofthis character for swaging onepiece, gold crowns, gold dummies, makinggold cusps, backing teeth, making matrices for inlays, making smallsaddles and reproducing anything from which an.

impression can be obtained.

Further objects and advantages of the invention, as well as thestructural features by means of which these objects are attained, willbe made clear by an examination of the following specification, taken inconnection with the accompanying drawings, in which Figure l is a sideelevation of my improved swaging forceps; Fig. 2 is an edge view of thesame; and Fig. 3 is a detail sectional view through the jaws of thedevice, showing one way in which the device may be used.

My improved tool comprises two crossed levers 1, 2,

' suitably pivoted intermediate their ends, as at 3, and

formed at their long ends with hand grips 4, 5, and at their short orouter ends with laterally offset jaws 6, 7. The closing movement ofthese jaws is adapted to be limited by an adjustable stop in the form ofa set screw 8 arranged in a threaded opening 9 in the handle 5 andadapted to engage the inner face of the handle 4:. In the jaws 6, 7 areformed at equal distances from the pivot 3 transverse apertures oropenings 10, 11 which are internally screw-threaded to receive threadedstems 12, 13. Each of these stems has a niche or recess 14 in its outerend for the reception of a screw driver or the like by means of whichthe stem may be adjusted in its jaw. Upon the inner end of the stem 13is formed or secured a metal cup or tray 16 adapted to receive moldineor any other suitable plastic material in which an impression may bemade. Upon the other stem 12 is an adjustable stop preferably in theform of a nut 15. The latter permits the stem 12 to be adjusted in thejaw 6 and locks it in its adjusted position when screwed against theinner face of the jaw 6, as shown in Fig. 1.

When the tool is used, as shown in Fig. 3, a small piece of moldine orthe like 17 is placed in the cup or tray 16 and an impression is made init by pressing the article to be reproduced against it. A ring 18 ofrubber or the like is then placed over the cup so as to form a containeror receptacle for fusible metal 19 which is poured into the ring whenthe latter is held in a horizontal position and then allowed to cool.Before cooling, however, the jaws of the tool are closed, so that theinner end of the stem 12 enters and becomes embedded in the metal. Whenthe metal is cool vaseline or the like is rubbed upon the die and thering and moldine are removed from the cup. Fusible metal is then pouredinto the cup and the jaws are again closed, so that a counter-die willbe produced. If desired, a warm piece of dental lac may be placed in thecup and used instead of the fusible metal. In addition to the abovedescribed use, it will be understood that the tool may be adapted to avariety of uses that will readily suggest themselves to one familiarwith dental work. It will be observed that this swager will require buta very small amount of fusible metal and hence the die and counter canbe saved for future use. In using the tool the work can be closelywatched and hence carefully done, and in backing teeth, the handles canbe brought together gradually, thereby lessening the danger of breakingthe teeth. The cup 16 and its stem 13 can be removed from the jaw 7 andused as an impression' tray to secure a cusp from a natural tooth in apatients mouth. It will be further observed that the tool is of simple,strong and durable construction and may be manufactured at acomparatively small cost. By having the stem 12 threaded, the die formedby the metal 19 may be removed from said stem for future use, if such isdesired.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States, is:-

1. A dental tool of the character described comprising a pair of pivotedhand levers having the jaws at their outer ends formed with opposingtransversely extending screw threaded apertures, screw threaded stemsadjustable in said apertures, a cup upon the inner end of one of saidstems and an adjustably mounted stop arranged upon the inner end of theother of said stems.

2. A dental tool of the character described comprising a pair of pivotedhand levers having the jaws at their outer ends formed with opposingtransversely extending screw threaded apertures, screw threaded stemsadjustable in said apertures, a cup upon the inner end of one of saidstems and a nut screwed upon the inner end of the other of said stems toprovide an adjustable stop, substantially as shown and described.

to engage the corresponding part of the other of said 10 levers to limitthe closing movement of the jaws of the levers, substantially as shownand described.

' In testimony whereof I hereunto aflix my signature in 2' presene oftwo witnesses.

PLINY A. MERCER.

